Cellular Respiration Quiz

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What is the final product of the oxidation of acetylCoA during cellular respiration?

ATP

CO2 (correct)

FADH2

NADH

Which stage of cellular respiration involves oxidative phosphorylation?

Oxidation of organic fuels to acetylCoA

Conversion of ATP to ADP

Oxidation of electron carriers with O2 (correct)

Conversion of acetylCoA to CO2 and electron carriers

What type of reaction is catalyzed by the pyruvate dehydrogenase complex?

Reversible decarboxylation

Irreversible phosphorylation

Irreversible decarboxylation (correct)

Reversible phosphorylation

What is the role of O2 in cellular respiration?

Final electron acceptor Signup and view all the answers

Where does cellular respiration primarily occur within the cell?

Mitochondria Signup and view all the answers

What is the main function of the PDH complex?

Converts pyruvate to acetyl Co-A Signup and view all the answers

Which of the following vitamins is NOT involved as a cofactor in the PDH complex?

Folic acid (B9) Signup and view all the answers

How does lipoic acid function within the PDH complex?

It can undergo redox reactions and attach acetyl groups Signup and view all the answers

What effect does phosphorylation have on the PDH complex?

It makes PDH less active Signup and view all the answers

Which of the following is a result of chronic decreased activity of PDH?

Chronic Lactic Acidosis (CLA) Signup and view all the answers

What characterizes acetyl Co-A in comparison to ATP?

It is more energy-rich than ATP Signup and view all the answers

Which enzymes are involved in modifying the activity of the PDH complex?

PDH-kinase and PDH-phosphatase Signup and view all the answers

What is the primary product when citrate undergoes isomerization in the citric acid cycle?

Isocitrate Signup and view all the answers

Which compound acts as the final electron acceptor in the electron harvesting process after FADH2 conversion?

NAD+ Signup and view all the answers

What is the main function of anaplerotic reactions in the citric acid cycle?

To replenish citric acid cycle intermediates Signup and view all the answers

Which molecule is formed when malate is oxidized in the final step of the citric acid cycle?

Oxaloacetate Signup and view all the answers

Which of the following describes the amphibolic nature of the TCA cycle?

It acts both as an energy-producing and a biosynthetic pathway. Signup and view all the answers

What is the primary role of the PDH complex in cellular metabolism?

To convert pyruvate to acetylCoA Signup and view all the answers

Which enzyme in the PDH complex is responsible for the decarboxylation of pyruvate?

Pyruvate dehydrogenase Signup and view all the answers

What coenzyme is utilized by the E1 enzyme during the decarboxylation of pyruvate?

Thiamine pyrophosphate (TPP) Signup and view all the answers

What is released as a byproduct during the decarboxylation of pyruvate?

Carbon dioxide (CO2) Signup and view all the answers

What type of reaction occurs when the acetaldehyde is transferred to the lipoyl moiety of E2?

Internal redox reaction Signup and view all the answers

What is the function of the swinging lipoyl arm in the PDH complex?

Connect E1 and E3 actively Signup and view all the answers

Which component is NOT part of the PDH complex?

Acetyl CoA synthase Signup and view all the answers

What happens after the free thiamine is released during the PDH process?

It is available to accept another pyruvate Signup and view all the answers

What is the structure of E2 in the PDH complex?

Trimeric Signup and view all the answers

Which of the following best describes the coupling of PDH complex enzymes?

They are mechanically coupled. Signup and view all the answers